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Net pension assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Summary of Net Pension Asset |
|  | 2017 |  |  | 2016 |
Pension assets |  | $ | 23,794 |  |  | $ | 25,946 |
Post-employment benefits |  |  | (19,997 | ) |  |  | (16,498 | )
Other employee benefits |  |  | (612 | ) |  |  | (622 | )
Total employee benefits liability |  | $ | (20,609 | ) |  | $ | (17,120 | )
Net pension asset |  | $ | 3,185 |  |  | $ | 8,826 |
Summary of Components of Net Benefit Expense | The following table summarizes the components of net benefit expense included under “Wages, salaries, benefits and other employees ‘expenses” in the accompanying consolidated statement of profit or loss:
|  | Defined benefit obligation |  |  | Fair value of assets |  |  | Defined benefit assets (liability) |
Year ended December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Current service cost |  |  | (1,767 | ) |  |  | — |  |  |  | (1,767 | )
Interest cost on net benefit obligation |  |  | (568 | ) |  |  | 778 |  |  |  | 210 |
Net benefit expense |  | $ | (2,335 | ) |  | $ | 778 |  |  | $ | (1,557 | )
|  | Defined benefit obligation |  |  | Fair value of assets |  |  | Defined benefit assets (liability) |
Year ended December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Current service cost |  |  | (1,724 | ) |  |  | — |  |  |  | (1,724 | )
Interest cost on net benefit obligation |  |  | (516 | ) |  |  | 689 |  |  |  | 173 |
Net benefit expense |  | $ | (2,240 | ) |  | $ | 689 |  |  | $ | (1,551 | )
|  | Defined benefit obligation |  |  | Fair value of assets |  |  | Defined benefit assets (liability) |
Year ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Current service cost |  |  | (1,638 | ) |  |  | — |  |  |  | (1,638 | )
Interest cost on net benefit obligation |  |  | (422 | ) |  |  | 532 |  |  |  | 110 |
Net benefit expense |  | $ | (2,060 | ) |  | $ | 532 |  |  | $ | (1,528 | )
Summary of Reconciliation of Net Pension Asset | The following table shows reconciliation from the opening balance to the closing balances for net pension asset and its components:
|  | Defined benefit obligation |  |  | Fair value of assets |  |  | Other employee benefits liability |  |  | Defined benefit assets (liability) |
At January 1, 2015 |  | $ | (12,778 | ) |  | $ | 18,559 |  |  | $ | (3,259 | ) |  | $ | 2,522 |
Current service cost |  |  | (1,638 | ) |  |  | — |  |  |  | — |  |  |  | (1,638 | )
Interest cost |  |  | (422 | ) |  |  | 532 |  |  |  | — |  |  |  | 110 |
Return on plan assets greater (less) than discount rate |  |  | — |  |  |  | 701 |  |  |  |  |  |  |  | 701 |
Experience (gain) loss |  |  | (809 | ) |  |  | — |  |  |  | — |  |  |  | (809 | )
Investment return |  |  | — |  |  |  | 105 |  |  |  | — |  |  |  | 105 |
Gross benefits paid |  |  | — |  |  |  | (599 | ) |  |  | — |  |  |  | (599 | )
Assumption changes |  |  | 222 |  |  |  | — |  |  |  | — |  |  |  | 222 |
Employer contributions |  |  | — |  |  |  | 3,749 |  |  |  | — |  |  |  | 3,749 |
Benefits paid |  |  | 957 |  |  |  | (774 | ) |  |  | — |  |  |  | 183 |
Adjustments |  |  | — |  |  |  | — |  |  |  | 1,504 |  |  |  | 1,504 |
At December 31, 2015 |  | $ | (14,468 | ) |  | $ | 22,273 |  |  | $ | (1,755 | ) |  | $ | 6,050 |
Current service cost |  |  | (1,724 | ) |  |  | — |  |  |  | — |  |  |  | (1,724 | )
Interest (cost) income |  |  | (516 | ) |  |  | 689 |  |  |  | — |  |  |  | 173 |
Return on plan assets greater (less) than discount rate |  |  | — |  |  |  | 518 |  |  |  |  |  |  |  | 518 |
Experience gain (loss) |  |  | (1,052 | ) |  |  | — |  |  |  | — |  |  |  | (1,052 | )
Investment return |  |  | — |  |  |  | 27 |  |  |  | — |  |  |  | 27 |
Gross benefits paid |  |  | — |  |  |  | (513 | ) |  |  | — |  |  |  | (513 | )
Assumption changes |  |  | (67 | ) |  |  | — |  |  |  | — |  |  |  | (67 | )
Employer contributions |  |  | — |  |  |  | 3,970 |  |  |  | — |  |  |  | 3,970 |
Benefits paid |  |  | 1,329 |  |  |  | (1,018 | ) |  |  | (75 | ) |  |  | 236 |
Adjustments |  |  | — |  |  |  | — |  |  |  | 1,208 |  |  |  | 1,208 |
As of December 31, 2016 |  | $ | (16,498 | ) |  | $ | 25,946 |  |  | $ | (622 | ) |  | $ | 8,826 |
Current service cost |  |  | (1,767 | ) |  |  | — |  |  |  | — |  |  |  | (1,767 | )
Interest (cost) income |  |  | (568 | ) |  |  | 778 |  |  |  | — |  |  |  | 210 |
Return on plan assets greater (less) than discount rate |  |  | — |  |  |  | (21 | ) |  |  | — |  |  |  | (21 | )
Experience gain (loss) |  |  | (2,033 | ) |  |  | — |  |  |  | — |  |  |  | (2,033 | )
Investment return |  |  | — |  |  |  | 88 |  |  |  | — |  |  |  | 88 |
Gross benefits paid |  |  | — |  |  |  | (440 | ) |  |  | — |  |  |  | (440 | )
Assumption changes |  |  | (226 | ) |  |  | — |  |  |  | — |  |  |  | (226 | )
Employer contributions |  |  | — |  |  |  | (1,677 | ) |  |  | — |  |  |  | (1,677 | )
Benefits paid |  |  | 1,095 |  |  |  | (880 | ) |  |  | — |  |  |  | 215 |
Adjustments |  |  | — |  |  |  | — |  |  |  | 10 |  |  |  | 10 |
As of December 31, 2017 |  | $ | (19,997 | ) |  | $ | 23,794 |  |  | $ | (612 | ) |  | $ | 3,185 |
Summary of Sensitivity Analysis for Actuarial Assumptions | The following were the principal actuarial assumptions at the reporting date:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Economic assumptions - |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 3.15 | % |  |  | 3.37 | % |  |  | 3.45 | %
Compensation - salary increase |  |  | 4 | % |  |  | 4 | % |  |  | 4 | %
Demographic assumptions - |  |  |  |  |  |  |  |  |  |  |  |
Mortality |  |  | RP - 2000 no collar |
Termination |  |  | 13% all ages |
Retirement |  |  |  |  |  |  |  |  |  |  |  |
Males |  |  | 62 years |
Females |  |  | 57 years |
Summary of Additional Information about Sensitivity Analysis for Actuarial Assumptions | Reasonably possible changes at the reporting date to one of the relevant actuarial assumptions, holding other assumptions constant, would have affected the defined benefit obligation by the amount shown below:
|  | December, 31 2017 |  |  | December, 31 2016 |  |  | December, 31 2015 |
|  | Increase |  |  | Decrease |  |  | Increase |  |  | Decrease |  |  | Increase |  |  | Decrease |
Discount rate (0.5% movement) |  | $ | (506 | ) |  | $ | 537 |  |  | $ | (410 | ) |  | $ | 434 |  |  | $ | (366 | ) |  | $ | 388 |
Salary rate (0.5% movement) |  |  | 99 |  |  |  | (89 | ) |  |  | 122 |  |  |  | (117 | ) |  |  | 114 |  |  |  | (109 | )
Summary of Expected Contribution Payments to Defined Benefit Plan | The following payments are expected contributions to the defined benefit plan in future years:
|  | 2017 |  |  | 2016 |
Up to one year |  | $ | 3,424 |  |  | $ | 2,823 |
One to five years |  |  | 10,794 |  |  |  | 9,195 |
Over five years |  |  | 11,401 |  |  |  | 9,453 |
Total expected payments |  | $ | 25,619 |  |  | $ | 21,471 |

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